Improvement in cupola-furnaces



E. VOISIN. y

- CUPDLA-FURNACE. No.172,8 36. Patentgdfr'eb. 1, m76."

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- Wmmxw UNITED EUGENE voIsI-N,'or- Bouiens; F

ANGE, AssIeNoR- To j PIERRE' ,AiMAB'Ln' 4'WOTQR LE LUBEZ, OFLO'NDON,ENGLAND y l To all 'whom it muy concern:

Be it ,known lthat I, EUG'NE ."Vois'nv,

` Bourges, in theltepublicof ;I rance, civil cn- .gineer7 have vinventedcertain Improvements in Cupola-Furnaces, of which' the following is aspecification:

The object of these at the throat'or top thereof, and by which im-`provc'nnen ts I ecoillomi'ze fuel, greatly increase the melting-powerofl the furnace, and keep the throat'of they furnace comparatively coolsecondly,fto enable a much largerz'quantity of molten metal thanhitherto to be collected from a'furnac'e at onetime, thereby effectingYan economy of time and labor where large castings have to bemade.

To carry out the first part ofmy invention,- lI employ, insteadoiffthev` ordinary tuyere or,

" highlycombustible and I place a second set or row of tuyeres, equal innumber with the lower`ones, and of such specific dimensions, as comparedwith such lower ones, as shall serve to supply to the above-mentionedcombustible gas (CO) just the quantity of air necessary for effectingits thorough combustion in the interior, instead of letting it burn towaste at the throat of the furnace, as hitherto. This second set oftuyeres is so placed that the saidcombustible gas is consumed While itis in contact with the metal, thus producing a second zone of fusion,thereby considerably reducing the consumption of coke and-acceleratingthe melting-power of the furnace.

The gases being consumed in the interior of the furnace no ame isproduced at the throat of the furnace While it is charged. TheV numberof tuyeres varies according to the size of the cupola, and is the samefor each row.

. The tworows or sets of tuyeres are always Worked together, the airbeing supplied therev improvementsis, first,- to effect the combustionin the interior ofthe furnace itself of theJ gases, Which'in,thelordiunary construction ofa cupola-furnace are burntl formed on theoutside or Within lthe ironcasing ofthe furnace, .andl communicatingwith the` fan or blast enginel.

The second part of this invention'consistsin the application to orplacing at the back-of. ,cupola-'furnaces of a chamber yor receiver on-a level,vand always in communication, With the Crucible. or lhearth. ofvthe furnace, in .such a wvay as to cause the moltenmetal tolretain-itsl heat While it is being collected, thereby ena-.L .bling alarger quantity ofl metal than hitherto l. to be run ott' at one time,and so a1low.of'v large castings being made froma comparatively smallfurnace.

Having thusl descrihe'dthe nature -otfmy-v 'said invention, I Will nowYproceed I to more particularly'describ'e the same, and the means14 forcarrying it into effect,- by referenceto sthe accompanyingdrawing,inv\vhich-.

Figure l is-a front elevationof a cupola-furi nace with the first, partof my improvements:

applied thereto; Fig, 2, a, vertical section of same. Fig. A3 is ahorizontal section onjline a, lb of Fig. l; and.Fig.. 4,ahorizontalsectionon-- linec dLFig, ,1; Fig.v 5,.ver tical section, andFig. 6, a horizontal section of a cupola-furnace, showing thedistributing-chamber placedinside the iron casing; Fig. 7, verticalsection figures represent also be placed Within the iron casing, ashereinbefore described, and as shown inFig. 5. B is a pipe for conveyingthe blast into the chamber A; T T, the first row of tuyeres for burningthe coke producing the gas CO2, and

forming the rst zone of fusion; t t, second row of tuyeres of a smallersize than the irst row, and serving to consume the gas-oxide ofcarbon-immediately after its production,

thus creating the second zone of fusion. I

place the two rows of tuyeres at a distance from each other'of from onefoot eight inches 1 specificati@ farming part of Laers Patent No; 172,836, uatei February i, 1576; ,application mee4 m November-13,1574.

for drawing oi' the moltenmetal `from the crucible; G, cast-iron liningto protect the brick-work at the throat of the furnacefrom the effectsof theconcussion of the pieces of metal thrown into the furnace.

In Figs. 7 and 8,'B lis the chamber or receiver placed at the back ofthe cupola, and

`constantly communicating with the crucible orhearth C by means oftheopening O in the lower part of the sole-plate, thus allowing themoltenmet-al to run from the crucible into the receiver while stillremaining in communication with the metal in the crucible. Y

. When the receiver contains a sufficient quantity of metal for therequired casting, the furnace is tapped and the liquid metal passes fromthe receiver through the opening 0, and throughthe hot furnace -out bythe door P, having retained nearly the whole of its heat by beingconstantly heated by the incoming hot metal from the crucible.

When the receiver is not required the opening O is stopped up, and thecupola may then1 be used as if it had no receiver. v

-The improvements hereinbet'ore described are applicable to ordinarycupolas. v

Having now described my said invention, and the best -means I amacquainted with for carryingthe same into effect, VI would have itunderstood that I lay nb claim, broadly, to the Vmere employment ot' twoor more rows of tuyeres, irrespective of their character and the effectsproduced by them; nor, broadly, to an annular chamber communicating withtwo Vor more rows of tuyeres; nor to a receiver, per se; but only, ashereinbefore described, as to the manner in which it is to bemused andthe duty which it performs, such disclaimed devices having been beforeemployed in connection with cupola-furnaces-but for other purposes-in adiii'ereut manner and with different results from those herein claimed;but What I do claim isi 1; In a cupola-furnace, the describedcombination and specific arrangement of tuyeres in two rows of equalnumber, the sectional area of each of those;` ot' the upper row beingexactly one-half that of eac'h ot' those of the lower row, and servingto supply to the gases the requisite quantity of atmospheric air foreffecting their thorough combustion within the furnace, as and for thepurpose set forth. 2. In a cupola-furnace, a second (as distinguishedfrom a third, fourth, or other) set or row of tuyeres, havingythe samenumber of tuyeres as has the first set or row, and having tuyeresseverally of one-half the area of the several tuyeres of the first row,and introducing streams ,of air in contact 4with the metal, and servingto create a second zone of fusion by consuming and thoroughly burning inthe interior of' the furnace the gases which have hitherto been consumedat the throat,`

as hereinbef'ore described. y

3. The combination of the receiver R at-the back of the cupola-furnacewith the crucible or hearth, whereby the'metal in the receiver is inconstant communication with that in the crucible, and free, when thefurnace is tapped, to pass back through the intensely-heated hearth ofthe furnace, as and for the purpose hereinbefore described.1

q E. VOISIN. y Witnesses H. VoURIoT, F. BAUY.

